Table of Contents
- 1 What is a Polycistronic mRNA and why is it useful in bacterial system?
- 2 Why do prokaryotes use Polycistronic mRNA?
- 3 Why are bacteria Polycistronic?
- 4 What is the meaning of Polycistronic?
- 5 What is the advantage of Polycistronic mRNAs compared to Monocistronic mRNAs quizlet?
- 6 What are polycistronic mRNAs?
- 7 Which operon produces polycistronic mRNA?
What is a Polycistronic mRNA and why is it useful in bacterial system?
One region that exhibits a group of different polycistronic messages from the same region is the psbb/psbH/petB/petD region….Transcription Products.
| Gene | Product | Complex |
|---|---|---|
| psbH | 10 kd phosphoprotein of PSII | PSII |
| petB | cytochrome b6 | Cytochrome |
| petD | subunit 4 of cytochrome b6/f | Cytochrome |
Why do prokaryotes use Polycistronic mRNA?
Polycistronic mRNA is mRNA that codes for multiple different protein products. With Polycistronic mRNA, prokaryotes have less flexibility in regulating gene expression and that’s because when they produce that mRNA all of those protein products on that Polycistronic mRNA are going to be produced simultaneously.
What are Polycistronic mRNA?
The term polycistronic is used to describe an mRNA corresponding to multiple genes whose expression is also controlled by a single promoter and a single terminator. Polycistronic mRNAs are also called operons. All eukaryotic mRNAs are monocistronic.
Why is eukaryotic RNA Monocistronic?
Generally eukaryotes have Monocistronic mRNA. This is because each of these proteins A, B, and C are produced by different mRNA molecules that can each be regulated independently.
Why are bacteria Polycistronic?
In prokaryotes, genes which encode proteins with relationships in a metabolic pathway form Operons – which produce polycistronic mRNA’s. An operon is in bacterial DNA, a cluster of contiguous genes transcribed from one promoter that gives rise to a polycistronic mRNA.
What is the meaning of Polycistronic?
polycistronic Describing a type of messenger RNA that can encode more than one polypeptide separately within the same RNA molecule. Bacterial messenger RNA is generally polycistronic. Compare monocistronic. A Dictionary of Biology.
Why is Polycistronic I RNA formed during the operon?
What is a polycistronic mRNA quizlet?
Polycistronic mRNA refers to a messenger RNA which encodes two or more proteins. Polycistronic messenger RNAs participates in the process of protein synthesis (translation) in prokaryotes.
What is the advantage of Polycistronic mRNAs compared to Monocistronic mRNAs quizlet?
What is the advantage of polycistronic mRNAs compared to monocistronic mRNAs? Polycistronic mRNAs allow for the regulation of the transcription of sets of bacterial genes functioning in the same metabolic pathway.
What are polycistronic mRNAs?
The messenger may later be cleaved into individual messages, each of which is translated into a single protein, or a giant polypeptide chain may be translated that is later cleaved to yield the individual proteins. Polycistronic mRNAs are common in prokaryotes. For example, the lac operon (q.v.) of E. coli generates a polycistronic mRNA.
What is monocistronic and premRNA?
Monocistronic mRNA refers to eukaryotic mRNA that consists of a single cistron. Therefore, it can produce a single protein. The nascent transcripts of genes are called the pre-mRNA. Pre-mRNA and other nuclear RNA are collectively called heterogeneous nuclear RNA (hnRNA).
What does polycistronic mean in biology?
The term “polycistronic” describes the situation in which two (bicistronic/dicistronic), three (tricistronic), or more separate proteins are encoded on a single molecule of messenger RNA (mRNA). In prokaryotes, polycistronic expression is common.
Which operon produces polycistronic mRNA?
An operon that produces polycistronic mRNA consists of a leader and a trailer sequence. The leader sequence is the first gene followed by an intercistronic region and the sequence of the second gene.